Simply removing the carbon deposits that have accumulated in the intake valves and combustion chambers of your GDI engine can achieve all the effects you want. SMOGDOCTOR's VB68a is the solution. 

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VB68a uses a special formula to break down carbon deposits that reduce vehicle performance. Unlike general foam-type carbon cleaners, it contains a concentrated cleaning chemical solution, so it has a more reliable and strong cleaning effect with high performance and concentration. No need to repeat it multiple times or try various methods, just one VB68a is enough. Regular cleaning with VB68a stabilizes rough idling, increases power and torque, solves various problems such as poor starting, and reduces vehicle exhaust fumes. This also provides excellent fuel efficiency.